For vibration problems caused by coupling faults in misalignment-rubbing rotor systems with rotor eccentricity,a dynamic model of the sliding bearing-rotor system was established under the condition of misalignment-rubbing coupling,and a series of strong nonlinear couplings were considered,such as the misalignment force of the gear coupling,the oil film force of the sliding bearing,the rotor eccentricity and rubbing.Based on multi-parameter and multi-objective co-simulation,the relationship between key parameters and system response was obtained,and the concepts of maximum rubbing force and duty cycle in the field of telecommunications were introduced to quantitatively characterize the dynamic characteristics of the rotor model.The results show that the existence of misalignment leads to even frequency multipliers such as 2× and 4× in the system,and the axis center trajectory of system shows the shape of “8”.The change of eccentricity directly affects the type and distribution of periodic motion of the system.When the eccentricity changes from small to large,the first-order and second-order critical speeds of the system increase significantly,which directly limit the response amplitude of the oil film force.However,the 2× frequency amplitude generated by misalignment is unaffected.Finally the reasonable value range of eccentricity is obtained.